764 Environmental Monitor User manual
Contents
1. The first line has column titles separated by commas and a fifth value giving information about the log start tome period etc This data will look similar to 2008 10 12_1308_000010_0010901 AName 0000544771 YYYY MM DD_HHmm_hhmmss_rrrrrrr NNNNNNNN ssssssssss YYYY MM DD Log start date HHmm Log start time hours and minutes seconds always zero hhmmss Log interval hh hours mm minutes ss seconds rrrrrrr no of records in file NNNNNNNN Logger name with extra to make 8 characters ssssssssss Misc logger status values 15 CLOCK The 764 has a built in clock this is used to show the time of maximum and minimum values and for data logging The date functions are valid until January 2098 so the unit 1s completely year 2000 compliant Setting the Time To set the time proceed as follows the procedure can be abandoned at any time by pressing the X button 1 Press Set Clock Set time The display shows the current time with the hours highlighted De Use and buttons to adjust the hours to the correct value and press the Set button 3 The minutes are now highlighted Repeat 2 above to set the minutes when the set button is pressed the seconds are set to zero Setting the Date To set the date proceed as follows the procedure can be abandoned at any time by pressing the X button 1 Press Set Clock Set date The display shows the current date as Day Month Year with the day highlighted note that the d2. Ever Ready LR6B4 Nickel Cadmium rechargeable types can be used but they cannot be charged inside the instrument Mains Power Supply The optional external mains power supply can be connected to the power input socket on the right hand side of the instrument This socket is only fitted if requested with order because the hole required compromises the moisture seal on the casing Software Version The internal software version is displayed when the 764 is turned on A typical start up message might be ELSEC 764 V2 1 in this case the software version is 2 1 17 CALIBRATION The calibration information is kept in non volatile EEPROM If this fails the instrument displays Mem Fail when turned on and will load default calibration values and future readings may be 25 in error If this happens a question mark is displayed on the top right of the display with suspect readings Humidity Like most other RH sensors the 764 should be checked every 6 months or a year This can be done by returning the unit to the manufacturer or by using the optional humidity calibration kit The Calibration Kit This utilises the fact that some salts provide a constant humidity above a saturated solution The humidity sensor is placed in a sealed chamber with a saturated solution of a salt and is then told to calibrate itself the 764 then measures the current temperature and calculates what the humidity should be above that salt allowing it
3. also shown Unless they are hidden by pressing Set Clock Hide Unhide If a battery symbol appears at B it means that the batteries need to be replaced Min amp Max are reset by pressing Set Max Min Reset Press Set 3 times The above format is slightly different for some parameters and can be altered by the user if required see below Set Button The blue Set button is used to access advanced functions change units etc If it is pushed once a menu similar to that below is shown Max Min gt Display gt Units gt Clock gt Calibrate gt The first menu item Max Min is highlighted different menu items can be highlighted using the E and buttons The wanted action is done by highlighting the appropriate menu item and pressing the Set button To abort without doing anything press the X button In some cases a further sub menu is displayed with more choices Elsewhere in this manual directions in the form Set item1 item2 are given This means Press Set select item1 in the first menu press Set again select item2 in the next menu and press Set To take a measurement without having to look at the display while the reading is taken for example where the operators head may effect the reading proceed as follows Position the monitor where the reading is to be taken Push the appropriate button for 1 2 seconds and release Hold the monitor in position for at least 2 seconds Ra Ww N e Without operating any butto
4. and if a low level of UV is present it will be detected and displayed Visible Light This can be displayed either in Lux or Foot candles To change the units press Set Units Lux Footcandl A visible light readout is provided to control illumination and limit damage done by visible light Normal museum light levels should be limited to 150 250 Lux Once measurements have been made the light level can be altered if necessary and UV filters can be fitted on windows fluorescent tubes or other UV producing light sources as required These filters often deteriorate over a period of years so it is essential to re check them periodically Magazine reprints on the subject of museum lighting UV etc can be obtained from the manufacturer Suggested light levels for various other purposes are given below Corridor stairs etc 100 150 Lux Warehouses storage bays 100 150 Lux General office work 300 500 Lux Rough bench machine work 300 500 Lux Medium bench machine work 500 700 Lux Drawing offices 750 1000 lux Fine bench work 1000 1500 Lux Fine inspection 1500 3000 Lux Minute work 3000 5000 Lux Temperature Temperature can be measured in degrees Centigrade or Fahrenheit To change the units press Set Units C F Humidity Humidity is measured as relative humidity RH This is the fraction of the maximum amount of water that the air can hold at the current temperature and pressure In gen
5. samples missing or wrongly prepared too small Sensor damaged or disconnected Other Calculation Sensor damaged or disconnected overflow Notes Even if Done is displayed the following steps still have to be performed to complete the calibration If Fail is displayed clean out the chambers in running water dry thoroughly and do the whole procedure again ignoring any further Fail messages until step 8 below If step 8 still produces a fail message it indicates that the humidity sensor is damaged requiring the return of the unit to the manufacturer for repair 8 Repeat steps 5 6 amp 7 with the Sodium Chloride chamber selecting Set Calibrate Humidity NaCl 75 in step 7 NOTE In later versions of the 764 there are menu options of 35 and 75 that can be used with other calibration standards Do not use these options with the ELSEC calibration salts MgCl and NaCl 9 If the sample chambers are to be kept charged then put both top and side lids on and keep on a level surface Otherwise clean them in running water and dry thoroughly 19 Temperature The 764 is fitted with a solid state temperature sensor that should not normally require calibration The unit can be checked by putting it together with another known accurate temperature measuring device for at least an hour Make sure that the two sensors are within 2cm 1 of each other and that neither are close to anything hot or cold sunlight e
6. the exactly same position under exactly the same lighting conditions with the operator being very careful not to shade the meters differently 21 SERVICE AND SUPPORT For support and repairs contact Littlemore Scientific Engineering Gutchpool Farm Gillingham Dorset UK SP8 5QP Tel 01747 835550 Fax 01747 835552 Email supportO elsec co uk http www elsec co uk This equipment complies with EU Directive 2002 96 EC The symbol of the crossed container on the equipment shows that the product at the end of its useful life must be collected separately from other refuse When it is disposed of in the European Union it should be placed with other electronic waste at the place designated by the waste collection authority 22 SPECIFICATIONS Method of radiation detection Visible wavelength range Visible power range UV wavelength range UV power range UV proportion range RH sensor RH range Display resolution Accuracy Angular response Readout Data logging time intervals Time till full Data logging storage capacity Computer Interface Date functions Batteries Battery Life External Power Supply If available Operating Temperature Dimensions Weight Twin silicon photodiodes connected to microprocessor 400 700nM CIE response No correction required for different light sources 0 1 200 000 Lux 0 1 20 000 Foot candles 300 400 nM 2 50 000 mW M 0 10 000 uW Lumen Cap
7. the installer file RView38 exe to RView38 zip 2 Create a folder C Program Files ELSEC R View or similar 3 Open the RView zip file by clicking on it 4 Drag the files RVIEW EXE and RVIEW HLP from RView38 zip to the newly created folder Ignore any other files in RView38 zip 5 Create a shortcut to the new copy of RVIEW EXE one way is to right click on it and select send to and desktop 6 Drag the shortcut to the start menu 13 Viewing the Results using RView For more detailed information on RView see the help file When RView is started an empty window is shown One or more data files can be opened by selecting File Open on the menu or pressing the appropriate button on the toolbar When a data file is opened the information is displayed as a graph in it s own window More than one graph can be open at any time The graph can then be manipulated in the following ways Change the graphed parameters If Show is selected on the menu a list of parameters that can be plotted is shown with the current selection ticked The various items can be ticked unticked to change what is shown Make the graph bigger smaller Use the standard window controls on the top right of the graph window and or drag the edges of the graph as required Zoom to see part of the data in more detail Move the mouse cursor to one corner of the area of interest click and hold the left mouse button while moving the mouse cursor s
8. to work out the calibration constants The kit consists of two sample chambers a support stand 2 different salt standards and some pure water The calibration salts are Magnesium Chloride MgCl and Sodium Chloride NaCl these are not particularly toxic Sodium Chloride is common table salt but normal care should be exercised and they should be kept away from skin eyes and mouth Notes It is important that the procedure is done at a constant temperature so that when the calibration is done the temperature of the saturated salt is the same as the air above it The best place is an underground room if this is not available use somewhere with a constant temperature away from sunlight heaters open windows etc A closed wooden desk draw or cupboard is quite good If Magnesium Chloride is left exposed to the air ie with the lid off it will absorb moisture from the air until it overflows and makes a mess The calibration procedure is as follows 1 Read through the whole procedure before doing anything 2 Puta level teaspoon of Magnesium Chloride in the bottom of one chamber and the same amount of Sodium Chloride in the bottom of the other Be very careful not to contaminate the two salts with each other Label the 2 chambers 3 Put a few drops of the pure water onto the salts to make a paste there should be plenty of undisolved salt but none of it should be dry The level of the paste should be well below the side hole where the s
9. window on the PC If the 764 is just taken away without the link being officially terminated the computer will complain that it has lost communication this does not matter 11 Notes If there are problems with infrared communication in they can sometimes be solved by selecting File and Options in RView and setting the Infrared Mode to Socket and clicking on OK After the link is established Connected is shown on the 764 and the PC if transmission is interrupted e g by blocking the path between the 764 and the computer infrared receiver transmission will re start from where it left off only if communication is re established within 15 seconds If communication is blocked for longer than this then the link is broken and the process must be re started from step 1 If all the data is not transferred for any reason the procedure can easily be repeated though see the information on file names above If power has been lost then the 764 may forget how many records it has saved and no data will be transferred It is possible to force the 764 to transmit data by selecting File Get Data from RView the user then has to specify how many records are required and they are transmitted whether they are valid or not If battery power gets low during transmission a warning message is displayed but transmission continues for as long as possible but may not complete If this happens the battery should be replaced and the dat
10. 764 ENVIRONMENTAL MONITOR USER MANUAL NELSEC LITTLEMORE SCIENTIFIC ENGINEERING ELSEC Gutchpool Farm Gillingham Dorset UK Tel 44 0 1747 835550 Fax 44 0 1747 835552 Email elsec elsec co uk 764 DOC V3 704 CONTENTS INTRODUCTION lt a io 1 BASIC OPERA TION us as ooo 2 O O CO states lt Glsonetaceduualansusaseasanenntate 3 UNITS OF MEASUREMENT DT cotos toa 4 Ultra Violet UV a os 4 MISIDIS Petrel A S sateen calaemeestecas 5 TEMPE SS REEE 6 e dust a 6 MAXIMUM AND MINIMUM 63h teesiese tcc occaatacna cas edeceus it 7 DOES 8 o ete ene rece ee a a 8 ACK QUIS see ateontademnneed Guoneadaanbstes GepneadaenbatasGnpatadaesbataeGepacad nabs daatanatasssanays 8 DATA LOG OIN Escasa ana 9 A O 9 A A A Medoenseuteeeeeu teeters 9 Start Logging AAA O ON 9 SEG BOOGIE AU Pee demure 10 FRE SS TAMING TOG is 10 Logger PC Communications sisi anenecona ees 10 Installing the Software iscsi sett aa ialeernese diia aliada 13 Viewing the Results using RVICW cece cece eee eee e eee e eee e eee e eee eeeeeeeeeeeeeeeee 14 Pate re ro Mala iio iio eet aie a seen add 15 BBG ee en ee ere er Rte re OT tH TN ee ee S NCTE aI 16 Setting the TIME Beemer ren Seam reer eos ee te 16 SSN tio Dates 16 DateFormat aira unapenna adaon aa adaa a aea Eda A 16 Hiding the Clock irere eae a a i al alec ides 16 MAINTENANCE costs tito tao 17 Battery omone ana A AR 17 M i s P wer SUDOR aa 17 Software VerslOMeacusrcncoonitaortar prot
11. E x I Wrap data Logger Status 10796 Records Period 10 Sec Duration 1 day 5 59 20 29 01 00 14 06 00 to 30 01 00 20 05 10 408 Lux 31 7 mw MPUY 246 C 80 2 RH Download Close Connected COM If Auto Download was checked then any new data is downloaded automatically Otherwise if required click on the Download button to start transmission The infrared link is closed after all data has been sent Information on any logged data and the current readings updated every 5 seconds are shown under Logger Status The Get button can be clicked to check the current logger settings Clock log start time etc If Wrap data is checked logging will continue when the memory is full overwriting the oldest data If Sync is checked then the logger clock will be set from the PC when the Set button is clicked Otherwise it can be set using the 764 Clock controls If Now is checked the logger will start as soon as possible after Set is clicked otherwise any start time and date can be set Trigger is not used by the 764 The logger name can be changed This effects where the downloaded data is stored The Set button sends the settings on the PC Logger Clock start time interval name etc to the logger This also terminates the connection The Set button is enabled when a valid log interval is chosen The infrared link can be closed by pressing the X key on the 764 or closing the Set amp Download
12. a a eane aa a aeoea dreet 17 CAUIBRATIO Na tias 18 A dico 18 The Calibration Kitre T a 18 Temperaturene seen eneen O EN TENE EKEN EEA EENE EEE EEEN ER aa AAE ERA E 20 UV amp Visible VGN Le foc es hs hee se nee ee ent 21 SERVICE AND SUPPOR Tasa sea a O 22 SPEGIFICR CON SU os 23 PRINTED 23 Oct 09 INTRODUCTION One of the primary responsibilities of the custodian of artworks and museum artefacts is to preserve them for future generations How they are stored and displayed is central to this the 764 Environmental Monitor is an easy to use tool to help in achieving the safest long term protection For many years it has been recognised that one of the major causes of damage to museum objects and other antiquities is the fading and rotting effect of light on the object The most damaging part of the illumination is its ultraviolet UV content Using the 764 measurements can be taken of the proportion of UV present as microwatts per lumen uW lumen the total amount of UV as milliwatts per square meter mW M and the amount of visible light present Lux Most objects are also sensitive to humidity and temperature The 764 also measures humidity as relative humidity and temperature as C or F The 764 can be left for extended periods to log the above parameters at a user set interval 10 seconds to 1 hour The saved data can then be transferred to a computer for display graphing etc We always want to improve our products If you
13. a retrieved using the method described in the paragraph above 12 Installing the Software Install the PC Infrared Adaptor as instructed in your adaptor s user manual Some adaptors can simply be plugged in and are automatically recognised by Microsoft Windows Others require software to be installed BEFORE they are plugged in Test the infrared adaptor Aim the 764 at the computer IR port and select SET Data Logging Transmit After a few seconds the 764 should recognise the presence of the PC and display the PC name No data will be transmitted unless the RView program is running If this does not happen further investigation of the computer s infrared installation is required To install the RView software run the installation program that is provided on a floppy disc or that has been downloaded from our web site www elsec co uk and follow the instructions given The installation file is called Rview21 exe or similar At the time of writing Rview has been tested with Microsoft Windows 95 98 NT 2000 and XP Some early versions of Windows 95 have no infrared drivers or unreliable ones Infrared version 2 0 or higher should be installed Windows 98 2000 and XP infrared drivers work well RView version 3 8 will work with Windows Vista but the installer is not Vista compatible To install manually proceed as follows only do this for Windows Vista and if you understand computers if you don t then get assistance 1 Rename
14. acititive film type 0 100 RH Lux 0 1 up to 100 then 1 Foot candles 0 1 up to 100 then 1 UV 0 1 up to 100 then 1 Proportion of UV 1 uwW Lumen Temperature 0 1 C or F RH 0 1 Light 5 1 displayed digit UV 15 1 displayed digit Temperature 0 5 C 0 9 F RH 3 5 0 90 otherwise 5 Cosine Light amp UV 8 line graphical Liquid Crystal Display with automatic backlight 10 seconds 30 hours 1 minute 72 days 10 minutes 75 days 1 hour 454 days 10 900 readings of all 4 parameters IrDA compatible wireless infra red link Display as day month year or month day year 2 off alkaline AA type Approx 100 Hours continuous use or 12 000 readings taking 30 seconds each Battery life will be less if the display backlight is used 4 0 5 2V DC 100mA A suitable mains power supply can be provided as an optional extra please specify mains voltage required 0 50 C 150 x65 x 25mm 5 9 x 2 5 x 1 inches Including RH Temperature probe 165g 5 6 oz with batteries 23 24
15. ate is always shown in this order regardless of the date format setting as described below 2 Use and buttons to adjust the day to the correct value and press the Set button 3 The month is now highlighted Repeat 2 above to set the month 4 The year is now highlighted repeat 2 above to set the year Date Format The time and date are shown at the bottom of the display with every reading The date is normally displayed as day month year this can be changed to the American format month day year by pressing Set Clock DMY or MDY The format can be restored to day month year by repeating this Hiding the Clock If the date and time are not needed they can be hidden by pressing Set Clock Hide Unhide Repeat to unhide 16 MAINTENANCE The sensor windows should be kept clean and grease free Grease and finger marks that look clear may be opaque to UV Ensure that solvents do not come into contact with plastic parts especially the perspex window over the visible left hand sensor Battery The batteries should be replaced as soon as the battery symbol is seen on the bottom left of the display Any 1 1 to 2 5 volt AA style battery can be used though it is preferable to use alkaline cells because of their longer life and much reduced tendency to leak The battery compartment can be accessed by removing the single screw in the bottom centre of the case Suggested battery types 2 off required MANUFACTURER TYPE MN1500
16. ensor is to be inserted if any paste gets into the side hole then clean the chamber in running water dry and start again 4 Put both the top and side lids on the chambers and leave them on a level surface in a constant temperature environment for at least 2 hours 18 5 Insert the 764 sensor probe into the side hole of the Magnesium Chloride chamber push it all the way in A support stand is provided to place under the 764 so that it and the sample chamber are level Be sure not to get any paste on the sensor 6 Leave for at least 2 hours preferably overnight in the constant temperature environment The 764 does not have to be on 7 With the 764 probe still in the calibration chamber Press Set Calibrate Humidity MgCl 33 Sure will be displayed the Set button must be pressed again within 2 seconds to activate calibration The display will show Working followed by either Done if the 764 has been calibrated before usually the case Not Done if this is the first time any humidity calibration has been done on this instrument This indicates that the other salt still has to be used xx Fail Where xx is a code indicating the type of error Fail Meaning Possible causes code 10 RH for MgCl gt Calibration standards wrong way round RH for NaCl missing or wrongly prepared Sensor damaged or disconnected 12 RH difference Calibration standards wrong way round between
17. eral if the temperature is reduced the amount of water it can hold gets less So if the temperature of some air is reduced its humidity rises and at some point the air will not be able to hold the water it has and water will start to condense out form mist cloud or drops of water on a surface the relative humidity has reached 100 The temperature at which this happens is the dewpoint The 764 displays the dewpoint with the humidity and with the temperature The temperature dewpoint difference is often used as a measure of the likelihood of condensation fog occurring particularly in meteorology If the temperature is only one or two degrees above the dewpoint in the evening then fog is likely as the temperature falls during the night The UK National Trust tries to keep the indoor relative humidity between 50 and 65 aiming for 58 MAXIMUM AND MINIMUM The maximum and minimum values for each unit are displayed along with the day of the month and time the maximum or minimum occurred The values can be reset by pressing Set Max Min Reset This equates to pressing Set 3 times To find the date when maxima amp minima occurred press Set Max Min Date or Time repeat to display the times again The maximum and minimum values are also set when data logging is active DISPLAY Contrast The display contrast can be increased decreased by pressing Set Display Contrast UP or DOWN If this is done the menu continues to be displayed and t
18. have any suggestions please send them to us BASIC OPERATION To take a reading the appropriate yellow button is pushed depending on the measurement required and the reading is taken UV Ultra Violet uW lumen or mW M Vis Visible light Lux or Foot candles T Temperature Centigrade or Fahrenheit RH Humidity Relative Humidity The unit automatically turns off 10 seconds after the button is released unless a button is held down for over 5 seconds this will cause readings to be taken continuously until a button is pressed If the T and UV buttons are pressed together then all parameters are displayed at the same time Hold both the buttons down for over 5 seconds for a continuous readout Note that the buttons should be pressed firmly for a second or so to ensure reliable operation Typical display A Lux B 1234 C Min 1 2 21 08 14 D Max 3456 14 09 34 E B H L 3 11 06 10 20 Units of measurement Current reading Minimum reading since last reset day of month and time of minimum Maximum reading since last reset day of month and time of maximum FO ee H shows that the reading is held and the unit will turn itself off after 10 seconds of inactivity A round blob shows the unit is in continuous reading mode until a button is pushed nothing here means that a single reading is being taken The L indicates logging is in operation W is shown if logged data is wrapped The current time and date are
19. he set button can be pressed repeatedly until the required contrast is achieved Backlight The display backlight operation can be adjusted from the Set Display menu as follows Menu item Action Lamp off Backlight always off Lamp mostly off Backlight initially off turns on if visible light is less than 10 Lux Lamp mostly on Backlight is initially on turns off if visible light is more than 10 Lux Lamp on Backlight always on The backlight uses a considerable amount of power the more it is used the less time the batteries will last DATA LOGGING Data logging is an optional extra A standard unit can be upgraded to include data logging by returning it to the manufacturer If data logging is not fitted then the relevant menu items are not displayed If data logging is fitted Data logging is one of the options when the Set button is pushed Wrap Data If Wrap is set press Set Data logging Wrap then logging continues when the logger memory is full overwriting the oldest data If No wrap is selected press Set Data logging No wrap logging stops when the memory is full Show Status To see how much data has been saved when logging was started etc select Set Data logging Show status and the information is shown on the screen for 20 seconds Press the X button to clear the screen sooner Start Logging To start logging press Set Data logging Start and then select the log period and press Set agai
20. n If logging is started then any previously logged data is lost so be sure that saved data has been transferred before starting again The Log Period is how often readings are taken if the log period is short then it will be less time until memory space runs out The storage capacity is 10 900 readings of all 4 parameters UV Visible light temperature and humidity The other values e g dewpoint and uW Lumen are calculated from the 4 saved parameters Logging commences at a time so that measurements are taken at the start of each minute 10 minutes hour etc Log Period Max Log time Days Hours Mins Logging Commences 10 seconds 1 6 16 Start of next minute 1 Minute 7 13 40 Start of next minute 10 Minutes 75 16 40 about 2 1 2 months Next whole 10 minutes past the hour 1 Hour 454 4 00 about 1 year 3 months Start of next hour Logging will continue until the memory is full or a low battery condition is detected Stop Logging To stop logging press SetiData logging Stop SetiData logging Disable on older models This stops further readings being taken The logged data is saved until logging is started again Re Starting logging Data is saved in non volatile memory that retains data even if the batteries are removed BUT the memory that retains information about when the next log time is and the clock itself require battery power So if power is lost for any reason logging will not restar
21. ns by mistake move the monitor so the reading can be noted before it turns itself off UNITS OF MEASUREMENT Ultra Violet UV Traditionally UV has been measured in museums as the proportion of ultraviolet present This result is useful for checking a particular lamp or window because the proportion of UV does not change with the distance from the light source Using a simple rule the amount of UV on an object can be limited It is usual to arrange that the proportion of UV should not exceed 75uW lumen in museums and galleries though some organisations try to keep UV levels below 25uW lumen The damage is done by the total amount of UV falling on the object so it is useful to be able to measure this directly especially if non standard amounts of illumination are required The amount of UV should be as little as possible but in general should not exceed 20mW M again some organisations keep the level below 6mW M Both the above units are displayed when the UV button is pressed one in large characters the other smaller at the bottom of the screen Which is displayed where can be swapped by pressing Set Units y W Lumn mW M2 When measuring low levels of UV the 764 can take up to 5 seconds to take the reading So to get a reasonably quick response when initially turned on the unit only measures for one second and if UV levels are low this will show as zero If the UV button is pushed again the full 5 seconds is allowed for the measurement
22. o that the area of interest has a box drawn round it When the mouse button is released the graph is redrawn showing only the selected area Change the temperature units Select Show on the menu and the current units are shown C or F click on this to change the units Move the Legend When the graph is first drawn the legend box may hide part of the data This can be moved by clicking on the box and dragging it to a new location If it changes to a free floating window it can be removed completely or put back on the graph by clicking on it again Check the time value of a point on the graph Move the mouse cursor to the point of interest the time and value represented by the position is shown on a status bar at the bottom of the window Add Change the title of the graph Press the Titles button on the toolbar and enter the title as required Print the graph Select File Print on the menu Copy the Graph to the Clipboard Select edit copy on the menu or press the appropriate button on the toolbar The saved image can now be pasted into other programs documents etc 14 Data File Format This information is included for those who want to process logged data using applications other than RView RView saves the data downloaded from the logger as a CSV file comma separated variable This is a plain human readable text file each record of Lux UV 66 gt gt temperature and RH is on one line each value separated by a
23. t until both the time and the date have been set After this is done logging will continue leaving a blank in the memory for the data that was not recorded Logger PC Communications See below for information on installing the reception software on your computer 1 Start the PC program RView on the computer itd 2 Open the Set amp Download window by pressing the button or selecting Logger Set amp Download from the menu Something similar to the following is displayed Z Set amp Download Name Logger Clock M Syne 01 01700 z 0 00 00 i Start Time T Now ma MiA 01 01 99 0 00 00 Log interval y I Wrap data Logger Status Unknow T Auto download Close Trying to connect on IrComm port COM If Auto Download is checked then any new data is downloaded as soon as contact is made with the logger 3 Select Set Data logging Transmit on the 764 10 4 Within 10 seconds place the monitor with it s black end window the end with the RH and temperature sensor facing directly at the computer s infrared port within 30 60cm 1 2 feet When contact is made with the logger the computer requests the logger status and something similar to the following is shown Bl Set Download Al Name Logger28 Logger Clock m ma Jorwowoo mif ooo y Get Log Start Time Get Now 017017 0 00 00 mi 01 01 99 0 00 00 Log interval
24. tc If the units do not agree the 764 can be adjusted by selecting Set Calibrate Temperature this allows the user to change the temperature offset with the E and buttons before pressing the Set button Pressing X leaves the offset unchanged The offset is the temperature always in Centigrade that is added to the measured temperature Example Correct temperature is 20 4 C 764 indicates 20 1 C current offset is 0 2 C The offset should be changed to 0 1 C 20 UV amp Visible Light The 764 calibration should not drift with time but to be sure of accuracy the instrument can be returned to the manufacturer for a calibration check every 2 5 years The 764 has a very carefully defined frequency response i e which wavelengths of light it is sensitive to Other light meters are often more sensitive to infra red light than they should be and so will give a higher reading with light sources that contain infrared e g ordinary filament light bulbs Because the 764 has a cosine angular response it may give different readings to a type 762 which is relatively directional In other words the 764 is more sensitive to light coming at an oblique angle than the 762 Note that the human eye has a logarithmic response this means that if two luxmeters are placed side by side they may give different readings even if it looks like they are getting a similar amount of light To compare the readings on 2 meters they each need to be placed in
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